+ <div class="entry">
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/Some_notes_on_fault_tolerant_storage_systems.html">Some notes on fault tolerant storage systems</a></div>
+ <div class="date"> 1st November 2017</div>
+ <div class="body"><p>If you care about how fault tolerant your storage is, you might
+find these articles and papers interesting. They have formed how I
+think of when designing a storage system.</p>
+
+<ul>
+
+<li>USENIX :login; <a
+href="https://www.usenix.org/publications/login/summer2017/ganesan">Redundancy
+Does Not Imply Fault Tolerance. Analysis of Distributed Storage
+Reactions to Single Errors and Corruptions</a> by Aishwarya Ganesan,
+Ramnatthan Alagappan, Andrea C. Arpaci-Dusseau, and Remzi
+H. Arpaci-Dusseau</li>
+
+<li>ZDNet
+<a href="http://www.zdnet.com/article/why-raid-5-stops-working-in-2009/">Why
+RAID 5 stops working in 2009</a> by Robin Harris</li>
+
+<li>ZDNet
+<a href="http://www.zdnet.com/article/why-raid-6-stops-working-in-2019/">Why
+RAID 6 stops working in 2019</a> by Robin Harris</li>
+
+<li>USENIX FAST'07
+<a href="http://research.google.com/archive/disk_failures.pdf">Failure
+Trends in a Large Disk Drive Population</a> by Eduardo Pinheiro,
+Wolf-Dietrich Weber and Luiz André Barroso</li>
+
+<li>USENIX ;login: <a
+href="https://www.usenix.org/system/files/login/articles/hughes12-04.pdf">Data
+Integrity. Finding Truth in a World of Guesses and Lies</a> by Doug
+Hughes</li>
+
+<li>USENIX FAST'08
+<a href="https://www.usenix.org/events/fast08/tech/full_papers/bairavasundaram/bairavasundaram_html/">An
+cAnalysis of Data Corruption in the Storage Stack</a> -
+L. N. Bairavasundaram, G. R. Goodson, B. Schroeder, A. C.
+Arpaci-Dusseau, and R. H. Arpaci-Dusseau</li>
+
+<li>USENIX FAST'07 <a
+href="https://www.usenix.org/legacy/events/fast07/tech/schroeder/schroeder_html/">Disk
+failures in the real world: what does an MTTF of 1,000,000 hours mean
+to you?</a> by B. Schroeder and G. A. Gibson.</li>
+
+<li>USENIX ;login: <a
+href="https://www.usenix.org/events/fast08/tech/full_papers/jiang/jiang_html/">Are
+Disks the Dominant Contributor for Storage Failures? A Comprehensive
+Study of Storage Subsystem Failure Characteristics</a> by Weihang
+Jiang, Chongfeng Hu, Yuanyuan Zhou, and Arkady Kanevsky</li>
+
+<li>SIGMETRICS 2007
+<a href="http://research.cs.wisc.edu/adsl/Publications/latent-sigmetrics07.pdf">An
+analysis of latent sector errors in disk drives</a> -
+L. N. Bairavasundaram, G. R. Goodson, S. Pasupathy, and J. Schindler</li>
+
+</ul>
+
+<p>Several of these research papers are based on data collected from
+hundred thousands or millions of disk, and their findings are eye
+opening. The short story is simply do not implicitly trust RAID or
+redundant storage systems. Details matter. And unfortunately there
+are few options on Linux addressing all the identified issues. Both
+ZFS and Btrfs are doing a fairly good job, but have legal and
+practical issues on their own. I wonder how cluster file systems like
+Ceph do in this regard.</p>
+
+<p>Just remember, in the end, it do not matter how redundant, or how
+fault tolerant your storage is, if you do not continuously monitor its
+status to detect and replace failed disks.</p>
+</div>
+ <div class="tags">
+
+
+ Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/raid">raid</a>, <a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin</a>.
+
+
+ </div>
+ </div>
+ <div class="padding"></div>
+
<div class="entry">
<div class="title"><a href="http://people.skolelinux.org/pere/blog/Web_services_for_writing_academic_LaTeX_papers_as_a_team.html">Web services for writing academic LaTeX papers as a team</a></div>
<div class="date">31st October 2017</div>
</div>
<div class="padding"></div>
- <div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/Norwegian_Bokm_l_edition_of_Debian_Administrator_s_Handbook_is_now_available.html">Norwegian Bokmål edition of Debian Administrator's Handbook is now available</a></div>
- <div class="date">25th July 2017</div>
- <div class="body"><p align="center"><img align="center" src="http://people.skolelinux.org/pere/blog/images/2017-07-25-debian-handbook-nb-testprint.png"/></p>
-
-<p>I finally received a copy of the Norwegian Bokmål edition of
-"<a href="https://debian-handbook.info/">The Debian Administrator's
-Handbook</a>". This test copy arrived in the mail a few days ago, and
-I am very happy to hold the result in my hand. We spent around one and a half year translating it. This paperbook edition
-<a href="https://debian-handbook.info/get/#norwegian">is available
-from lulu.com</a>. If you buy it quickly, you save 25% on the list
-price. The book is also available for download in electronic form as
-PDF, EPUB and Mobipocket, as can be
-<a href="https://debian-handbook.info/browse/nb-NO/stable/">read online
-as a web page</a>.</p>
-
-<p>This is the second book I publish (the first was the book
-"<a href="http://free-culture.cc/">Free Culture</a>" by Lawrence Lessig
-in
-<a href="http://www.lulu.com/shop/lawrence-lessig/free-culture/paperback/product-22440520.html">English</a>,
-<a href="http://www.lulu.com/shop/lawrence-lessig/culture-libre/paperback/product-22645082.html">French</a>
-and
-<a href="http://www.lulu.com/shop/lawrence-lessig/fri-kultur/paperback/product-22441576.html">Norwegian
-Bokmål</a>), and I am very excited to finally wrap up this
-project. I hope
-"<a href="http://www.lulu.com/shop/rapha%C3%ABl-hertzog-and-roland-mas/h%C3%A5ndbok-for-debian-administratoren/paperback/product-23262290.html">Håndbok
-for Debian-administratoren</a>" will be well received.</p>
-</div>
- <div class="tags">
-
-
- Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
-
-
- </div>
- </div>
- <div class="padding"></div>
-
<p style="text-align: right;"><a href="index.rss"><img src="http://people.skolelinux.org/pere/blog/xml.gif" alt="RSS feed" width="36" height="14" /></a></p>
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+<li><a href="http://people.skolelinux.org/pere/blog/archive/2017/11/">November (1)</a></li>
+
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<li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
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+ <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (358)</a></li>
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+ <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
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